Avoid FreeBSD-SA-20:05.if_oce_ioctl

[master-q]

• FreeBSD-SA-20:05.if_oce_ioctl
• https://github.com/freebsd/freebsd/commit/94ef8815eec7bb02a0a47a835479b4a141604936

It's caused by unprivileged access. Such privilege may be easily avoided by ATS and VeriFast.

[master-q]

• oce_handle_passthrough just updates device firmware
• There are no hints that caller should call priv_check
• We can't avoid this issue